Microsoft execs said last month that enterprise customers would be able to access the Volume Licensing Service Center (VLSC) to get the Windows 8.1 Enterprise and 8.1 Pro bits, once they were made generally available. They noted at that time that Windows 8.1 (core) would not be available on VLSC.

Those promised Enterprise and Pro bits are available as of today, October 18, in the VLSC, Microsoft officials said. However, I am hearing from some volume license customers that they cannot see any listing for Windows 8.1 in the VLSC and they're being issued trouble tickets.

As Microsoft officials noted in an October 18 Springboard Series blog post, Windows 8.1 Enterprise cannot be updated via the Windows Store; it must be updated via the media from the VLSC.